144169
This number is a prime.
144169 is the concatenation of the squares of two consecutive numbers, 12 and 13. Also note the prime anagrams of 144169, i.e., 114649, 446911, 644911, 914461, 944161. [Bhattacharya]
It is also the concatenation of three squares (144, 16, and 9). Note that sqrt(144) = sqrt(16) x sqrt(9). [Trotter]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell